Evaluation of Stress and Strain Magnitude in Tapered and Cylindrical Implant Surrounding Bone, Used for Restoration of Mandibular Teeth: Finite Element Analysis in All-on-Four Concept

Hajizadeh, Farhad; Kermani, Mehdi Ekhlasmand; Sadafsaz, Mohammad; Motlagh, Amir Mahmoudi

doi:10.1615/jlongtermeffmedimplants.2021036788

Cited by 2 publications

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“…One of the main findings of the current study is the considerable effect that the load positions had on the distribution of the tested stresses. It should also be noted that in our FEA model, peak stress values were measured near the implant−bone interface, which may be explained by the stress distribution characteristic of the cylindrical implants modeled in the present study [63]. The geometry of the implant body and surface thread may have considerable effects on load transfer characteristics: while smooth, cylindrical implants may transfer dangerous shearing effects at the bone-implant interface (resulting in higher rates of implant failure) and through the introduction of (micro)threads to the implant architecture as a surface function these shear forces may transform into more tolerant force forms transferred to the bone surface [64].…”

Section: Discussionmentioning

confidence: 67%

Biomechanical Effects of Different Load Cases with an Implant-Supported Full Bridge on Four Implants in an Edentulous Mandible: A Three-Dimensional Finite Element Analysis (3D-FEA)

Szabó,

Matusovits,

Slyteen

et al. 2023

Dentistry Journal

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The long-term success and predictability of implant-supported restorations largely depends on the biomechanical forces (stresses) acting on implants and the surrounding alveolar bone in the mandible. The aim of our study was to investigate the biomechanical behavior of an edentulous mandible with an implant-supported full bridge on four implants under simulated masticatory forces, in the context of different loading schemes, using a three-dimensional finite element analysis (3D-FEA). A patient-specific 3D finite element model was constructed using pre- and post-implantation computer tomography (CT) images of a patient undergoing implant treatment. Simplified masticatory forces set at 300 N were exerted vertically on the denture in four different simulated load cases (LC1–LC4). Two sets of simulations for different implants and denture materials (S1: titanium and titanium; S2: titanium and cobalt-chromium, respectively) were made. Stress outputs were taken as maximum (Pmax) and minimum principal stress (Pmin) and equivalent stress (Peqv) values. The highest peak Pmax values were observed for LC2 (where the modelled masticatory force excluded the cantilevers of the denture extending behind the terminal implants), both regarding the cortical bone (S1 Pmax: 89.57 MPa, S2 Pmax: 102.98 MPa) and trabecular bone (S1 Pmax: 3.03 MPa, S2 Pmax: 2.62 MPa). Overall, LC1—where masticatory forces covered the entire mesio−distal surface of the denture, including the cantilever—was the most advantageous. Peak Pmax values in the cortical bone and the trabecular bone were 14.97–15.87% and 87.96–94.54% higher in the case of S2, respectively. To ensure the long-term maintenance and longevity of treatment for implant-supported restorations in the mandible, efforts to establish the stresses of the surrounding bone in the physiological range, with the most even stress distribution possible, have paramount importance.

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Section: Discussionmentioning

confidence: 67%

Biomechanical Effects of Different Load Cases with an Implant-Supported Full Bridge on Four Implants in an Edentulous Mandible: A Three-Dimensional Finite Element Analysis (3D-FEA)

Szabó,

Matusovits,

Slyteen

et al. 2023

Dentistry Journal

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“…Additionally, our experimental results have shown that local mechanical stresses appear at the bone-implant interface, which reduces the force required to cause fractures; this means that -especially in patients with a severely atrophic AP and relatively low bone quality -even the loss of a single implant after the surgery may eliminate the stabilizing effect of the implants on the mechanical properties of the bone structure, rendering it more susceptible to cracks and pathological fractures. Many studies have demonstrated and showed that the use of tilted implants in Ao4 increases tension around them, however, splinting of the prosthetic parts together is a viable method to decrease the amount of stress on the implants [148]: the publication of Sannino et al reported that implants placed at 15°, 30°, and 45°, with a greater angle at the implant-bone interface, exert the greatest stress, however, all stress values were under the mechanical stress values that would be dangerous for the implant or the bone [149].…”

Section: Discussionmentioning

confidence: 99%

Changes in the biomechanical properties of the bone during implant placement

Nagy

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Background: In this research the biomechanical properties of a bone model was examined. Porcine ribs are used as experimental model. The objective of this research was to investigate and compare the biomechanical properties of the bone model before and after implant placement. Methods:The bone samples were divided in three groups, Group 1 where ALL-ON-FOUR protocol was used during pre-drilling and placing the implants, Group 2 where ALL-ON-FOUR protocol was used during pre-drilling, and implants were not placed, and Group 3 consisting of intact bones served as a control group. Static and dynamic loading was applied for examining the model samples. Kruskal-Wallis statistical test and as a post-hoc test Mann-Whitney U test was performed to analyze experimental results.Results: According to the results of the static loading, there was no significant difference between the implanted and original ribs, however, the toughness values of the bones decreased largely on account of predrilling the bones. The analysis of dynamic fatigue measurements by Kruskal-Wallis test showed significant differences between the intact and predrilled bones. Conclusion:The pre-drilled bone was much weaker in both static and dynamic tests than the natural or implanted specimens. According to the results of the dynamic tests and after a certain loading cycle the implanted samples behaved the same way as the control samples, which suggests that implantation have stabilized the skeletal bone structure.

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Evaluation of Stress and Strain Magnitude in Tapered and Cylindrical Implant Surrounding Bone, Used for Restoration of Mandibular Teeth: Finite Element Analysis in All-on-Four Concept

Cited by 2 publications

References 0 publications

Biomechanical Effects of Different Load Cases with an Implant-Supported Full Bridge on Four Implants in an Edentulous Mandible: A Three-Dimensional Finite Element Analysis (3D-FEA)

Biomechanical Effects of Different Load Cases with an Implant-Supported Full Bridge on Four Implants in an Edentulous Mandible: A Three-Dimensional Finite Element Analysis (3D-FEA)

Changes in the biomechanical properties of the bone during implant placement

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